<template>
  <div>
    {{ num }} ------ {{ abc }}
    <hr>
    <hr>
    <son :a.sync="num" :b.sync="abc" />
  </div>
</template>

<script>

import Son from './Son.vue'

export default {
  components: {
    Son
  },
  data() {
    return {
      num: 100,
      abc: 200
    }
  }
}
</script>

Son
<style>

</style>
